Searching For Info About Adding A Second Story ?

What are the costs to California to add a second story addition per square meter in Los Angeles?
I want a second story added to a existing single-story home. The house is about 1463 square meters, and I want an extra 1500 square meters at the top to add. What is the average cost per square meter grow in Los Angeles, California
Two-story additions, it is difficult to pin down the cost per sf. This is mainly related to the substantial retro-fitting that will be made to the first floor foundation and walls. Keep in mind that the outer and inner walls must be made to the steps to properly support the new top. That being said, I would plan on $ 275 - $ 350 per sf. Also check your local city planning department before you hope that there is little to add. Many cities are Now reduce the allowable square feet on a parcel and the amount in excess relative to the ground. For example: up here in Cupertino, CA we are only allowed 45% of square meters, which is below the stairs to add. It is very limited. LA is not so strict.